At the rolling start Segrave took the lead from the front row which he shared with
Albert Divo's Delage, while Ascari immediately came through from the second row into second place. At the end of the first lap Segrave had a small lead over Ascari, Guinness, Campari and
Pietro Bordino (in a Fiat). They were then followed by Divo, Resta,
Giuseppe Pastore (Fiat),
Robert Benoist (Delage) and
René Thomas (Delage). On the second lap, Bordino was able to overtake Campari, Guinness and Ascari to move into second place, and near the end of his third lap was able to take first place with Segrave making a pitstop for new
plugs dropping him from second to 17th place. For the next few laps Ascari was able to keep up with Bordino, while Guinness had to defend his third place from Campari. Wagner had moved up to fifth place with the rest of the field struggling behind. On lap nine Bordino overshot a corner due to fading brakes, giving the lead to Ascari. Although Bordino retook the lead on the next lap he was forced to pit a few laps later to repair his brakes, putting him out of the race, eventually retiring after 17 laps. Ascari made a scheduled pitstop for fuel and tyres on lap 16, allowing Guinness into a small lead over Campari. On the next lap, however, Guinness blew a tyre forcing a wheel change dropping him to second. Segrave, who was a lap down, had to stop for a new riding mechanic as his had been hit by the tread of Guinness' blown tyre. The order after 17 laps was Campari with nearly a minute over Guinness and Divo, Ascari another two minutes behind in fourth, followed by Benoist, Wagner and Segrave in seventh and just over a lap behind Campari, the rest of the field now some way behind. Ascari quickly moved back up through the field and into first place on lap 20. On the following lap Guinness retired with engine failure giving Alfa Romeo first, second and fifth places, with the Delages in third, fourth and sixth. Over the next few laps the two leading Alfa Romeos stayed close together with Campari taking the lead during lap 27 only for Ascari to retake before the lap was over. Divo in the best placed Delage, was pushing, making up some time but not enough to worry the Italians. Segrave was the fastest driver on the track, moving up to sixth place and on the 29th lap setting the fastest lap of the race, 11 minutes 19 seconds. On the 32nd lap Ascari began to slow, being passed first by Campari, then a lap later by Divo. Finally with just one lap to go Ascari pulled into the pits. Ascari and his mechanic tried desperately to make the engine restart but the damage was terminal. Mechanic Ramponi attempted to push the car over the line but collapsed, so the Alfa Romeo was a non-finisher. Campari won the race by just over a minute from Divo with Benoist another ten minutes behind in third. == Classification ==